This Describe 2-Dimensional Cross Sections of Right Rectangular Pyramids video also includes:

If you were to slice the Great Pyramid of Giza with a plane, what two-dimensional figure would result? Using animation and the familiarity of the pyramids of Egypt, this video aids student understanding of the resulting cross-section. It begins with a review of right rectangular pyramids. This may be a new concept for some learners so be sure it is understood before going on. The second in a series, it is a complete lesson with the Coach’s Commentary and Guided Practice videos.